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subterranean (adj.)

c. 1600, from Latin subterraneus "underground," from sub "under, beneath" (see sub-) + terra "earth, the ground" (from PIE root *ters- "to dry") + -an.

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Definitions of subterranean

subterranean (adj.)
being or operating under the surface of the earth;
subterranean passages
Synonyms: subterraneous
subterranean (adj.)
lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell;
subterranean motives for murder
Synonyms: subterraneous / ulterior
From wordnet.princeton.edu